diff --git a/rust/hg-core/src/lib.rs b/rust/hg-core/src/lib.rs
--- a/rust/hg-core/src/lib.rs
+++ b/rust/hg-core/src/lib.rs
@@ -35,6 +35,7 @@ pub mod config;
 pub mod lock;
 pub mod logging;
 pub mod operations;
+pub mod progress;
 pub mod revset;
 pub mod utils;
 pub mod vfs;
diff --git a/rust/hg-core/src/progress.rs b/rust/hg-core/src/progress.rs
new file mode 100644
--- /dev/null
+++ b/rust/hg-core/src/progress.rs
@@ -0,0 +1,11 @@
+//! Progress-bar related things
+
+/// A generic determinate progress bar trait
+pub trait Progress: Send + Sync + 'static {
+    /// Set the current position and optionally the total
+    fn update(&self, pos: u64, total: Option<u64>);
+    /// Increment the current position and optionally the total
+    fn increment(&self, step: u64, total: Option<u64>);
+    /// Declare that progress is over and the progress bar should be deleted
+    fn complete(self);
+}